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Note 4 - Cash and Cash Equivalents and Short-term Investments (Detail) - The Company includes certificates of deposit with a remaining maturity of 90 days or less at purchas (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Total Fair Value | $ 49,211 | $ 44,855
Mutual Funds [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Total Fair Value | 27,582 | 24,851
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total Fair Value | 27,582 | 24,851
Mutual Funds [Member] |  |
Gross Unrealized Gains (pre-tax) | 337 | 383
Gross Unrealized Losses (pre-tax) | 9 |
Municipal Bond Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Total Fair Value | 21,629 | 20,004
Municipal Bond Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Total Fair Value | 21,629 | 20,004
Municipal Bond Securities [Member] |  |
Gross Unrealized Gains (pre-tax) | 862 | 617
Gross Unrealized Losses (pre-tax) | 128 | 15
Total Available For Sale Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |
Total Fair Value | 49,211 | 44,855
Total Available For Sale Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Total Fair Value | 27,582 | 24,851
Total Available For Sale Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Total Fair Value | 21,629 | 20,004
Total Available For Sale Securities [Member] |  |
Gross Unrealized Gains (pre-tax) | 1,199 | 1,000
Gross Unrealized Losses (pre-tax) | $ 137 | $ 15

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